commons-net.jar is the bytecode of Apache Commons Net library, which implements the client side of many basic Internet protocols.

Apache Commons Net Source Code files are provided in the binary packge (commons-net-3.8.0-bin.zip). You can download it at Apache Commons Net Website.

The source code of commons-net-3.8.0.jar is provided below:

⏎ org/apache/commons/net/telnet/TelnetNotificationHandler.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.commons.net.telnet;

/**
 * The TelnetNotificationHandler interface can be used to handle
 * notification of options negotiation commands received on a telnet
 * session.
 * <p>
 * The user can implement this interface and register a
 * TelnetNotificationHandler by using the registerNotificationHandler()
 * of TelnetClient to be notified of option negotiation commands.
 */

public interface TelnetNotificationHandler
{
    /**
     * The remote party sent a DO command.
     */
    int RECEIVED_DO =   1;

    /**
     * The remote party sent a DONT command.
     */
    int RECEIVED_DONT = 2;

    /**
     * The remote party sent a WILL command.
     */
    int RECEIVED_WILL = 3;

    /**
     * The remote party sent a WONT command.
     */
    int RECEIVED_WONT = 4;

    /**
     * The remote party sent a COMMAND.
     * @since 2.2
     */
    int RECEIVED_COMMAND = 5;

    /**
     * Callback method called when TelnetClient receives an
     * command or option negotiation command
     *
     * @param negotiation_code - type of (negotiation) command received
     * (RECEIVED_DO, RECEIVED_DONT, RECEIVED_WILL, RECEIVED_WONT, RECEIVED_COMMAND)
     *
     * @param option_code - code of the option negotiated, or the command code itself (e.g. NOP).
     */
    void receivedNegotiation(int negotiation_code, int option_code);
}

⏎ org/apache/commons/net/telnet/TelnetNotificationHandler.java

Or download all of them as a single archive file:

File name: commons-net-3.8.0-sources.jar
File size: 437325 bytes
Release date: 2020-01-22
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